title: UV-induced changes in urinary polyamine excretion in the mouse.
abstract: Exposure of hairless mice to the light of a germicidal lamp (254 nm) under conditions which are known to induce epidermal DNA synthesis, cell proliferation, and polyamine metabolism produced a marked increase of polyamine excretion in the urine which lasted for many days. The increase was about the same for free and acetylated polyamines. Although the ratio of N1-acetylspermidine/N8-acetylspermidine increased somewhat in the urine of animals exposed to UV, the increase was not significant enough to be useful as a marker of enhanced cell proliferation. A single topical dose of alpha-difluoromethylornithine, a selective inhibitor or ornithine decarboxylase, prevented the UV-induced increase of polyamine excretion in agreement with its effect on UV-induced epidermal polyamine turnover.
mesh_terms: D000107:Acetylation; D000818:Animals; D000518:Eflornithine; D005260:Female; D051379:Mice; D009952:Ornithine / Q000031:analogs & derivatives / Q000494:pharmacology; D011073:Polyamines / Q000652:urine*; D012867:Skin / Q000528:radiation effects; D013997:Time Factors; D014466:Ultraviolet Rays / Q000009:adverse effects*
chemical_list: D011073:Polyamines; D009952:Ornithine; D000518:Eflornithine